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DANIEL G. TERRELL, OF WAKEFIELI), PENNSYLVANIA.

Letters Patent No. 79,281, dated June 23, 1868.

IMPROVEMENT IN BRAKE FOP. HORSE-POWER MACHINE.

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'.lO ALL WIIOM IT MY CONGERN:

Be it known that I, DANIEL G. TERMLLL, of the town 'of Wakefield, in the county of Lancaster, and State of Pennsylvania, have invented a new and useful Improvement in Brakes for Horse-Power Machines; and I do hereby declare-the following to be a full, clear, and exact description of the same, reference` being had to the drawing accompanying this specification, and forming a part of the same, and to the figures and letters thereon, in which- V Figure 1 'represents a side elevationof my invention, showing the same in two positions.

My invention relates to an improvement in brakes for horse-power and other machines, by means of which the brake is caused to act on the driving-wheel, when any accident may happen to the belt or any part of -the .machinery independently `ot the attendant.

'It is well known to those who use endless-chain horse-power machines for threshing or other purposes, that, when a belt is broken or slips o`, as is sometimes the case, or when some part of the machinery breaks, great `danger arises'at once, from the fact that `the power of th'e horses being suddenly expended simply to turn the driving-wheel, causing a very rapid revolution ofthe same, nally throws the horses down and seriously injures them, or often destroys the machine, and endangers the lives ofall who are-near.

To remedy this, by supplying a brake which works automatically, in case of the slipping off ofthe belt, or breaking of thesame, or breaking of any part of the machine, which loosens the belt so much that it slips around the pulleys withontdriving the machine, and at the same time have the brake capable of being used as an ordinary brake, to be worked by the attendant, wheneverit is desired to lessen the speed of the driving-wheel, is the object'cf my invention.

In order that others may understand the construction and operation-ot` my'invention, ticularly describeit.

A represent the framework of an ordinary horse-power machine, having the driving-wheel, B, attached to it in the usual manner, motion being communicated to the thresher or other machine by abelt, C. The draw- .ing shows the' beltC as passing around drums atthe endet` the'horsei-powcr. The brake D is attached to near the pivoted end of the lever E, and is fitted to the conve'riity of the wheel, so that; when bearing upon it, the

Ywhole inner surface shall be in contact with it. The leverl E, which is of wood, of proper size and strength, is

pivoted at Fy quite near to the circumference of the wheel, while the -long and free arm extends backward, as shown. On the upper edge of the lever, at G, is a piece secured, which serves as a catch, by means of whichit is held up, so that the brake will not act on the driving-wheel when the machine is in motion. This catch rests i upon the latch H of the arm I, said arm being pivoted at J, on which it is free to turn. It is made of the form shown, and extends upwards and backwards above the bolt C, between it and thc frame, and carries, near its end, the drum K. This-drum K is made wide enough to run upon the upper surface vof the belt, and serves, by its weight, to keep the belt tight upon its pulleys. Being carried on the upper end of the arm I, and made of considerable weight, it rests upon the belt C all the while, and on the belt being removed by accident, such as breaking or or slipping oia pulley or wheel, ift instantly falls down, liberates the catch of the brake-lever froml the latch H, and brings the upper end of the arin'I against the upper part ofthe catch G, thereby pressing the same down with considerable force, and causing the brake D to ,act strongly upon-the wheel, and stopsits rcvolution almost instantly.

The lever E being very long, and the brake D attached so near its fulcrum, together with the weight of the druml K, renders the stopping of the driving-wheel certain, and almost instantaneou happening, while the drum K is used beneficially at all timesto kee there is no loss of power from the belt slipping on the wheel or pulleys. used as a. hand-brake at any time desired, by simply bringing it to one si s in the case of any accident At the same time the lever E may be de of the latch H, and pressing down When not in use it should ways in readiness (in case of accident) t'nr use, bymeans its free end, when the brake D will behrought against the periphery of the wheel. be raised up and retained by the latch II, so as to he al of the weighted drum K.

I will proceed to par-- p the tension of the b clt cquable, so that l There being but few parts, there is no liability to get out of order. f It 'is very simple inits construction, easily made, and applied to horse-powers of any form. It is automatic in its action, and at the same time has nothing to interfere with'its being worked bythe attendant preciselyA as; an ordinary brake, while it affords an effectual guard against any accidents that may happen to the machine oz" any of its parts.

Having thus described my invention, its construction7 and mode ofy operation, what I claim as new, is-

The' arrangement, in horse-powers, of the mechanism herein described,whereby the brake will be self-acting when the 'belt breaks or lies olf, anti also serves the purpose of a hand-brakegtostop ythe machine when the belt is on in running order, substantially as and for the purposes herein set forth.

In testimony whereof, I hereunto subscrbemy name in the presence of` DANIEL G. TERRELL. Witnesses:

Gno. W. ZooK,

ABNER BROWN. 

